CAIE IGCSE Physics 6.2.2.1 A Galaxies Contain Many Billions of Questions
Learn how light-year statements reveal when starlight left a star and how far stars are from Earth.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- interpret light-year statements to decide how long starlight takes to reach Earth
- recognise that other Milky Way stars are much farther from Earth than the Sun
- compare stellar distances using light-travel time and the light-year unit
CAIE IGCSE Physics 6.2.2.1 A Galaxies Contain Many Billions of Questions question 1
[Maximum number: 1]
The nearest star to the Sun is 4 light-years away.
A spaceship travels at 0.1 % of the speed of light.
What is the total time taken for a journey from the Sun to the star and back again?
A
400 years
B
800 years
C
4000 years
D
8000 years
D
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